When you help, you sell; when you sell, you don't help. When you help first, you sell second when you help second, you sell first. Provide helpful responses and include your product when it's relevant, and drive traffic to a basic landing page. You should clearly communicate the benefit of the page and have a next step that is easy, such as booking a call or a sign-up. It also gives you an insight into which engagement is effective and which isn't, as you can track how many people come from Reddit and see what happens after that.